Date: Fri, 15 May 2015 08:27:17 -0700 From: Sean Bruno <sbruno@ignoranthack.me> To: freebsd-hackers@freebsd.org Subject: Re: How to get anything useful out of kgdb? Message-ID: <55561055.9020902@ignoranthack.me> In-Reply-To: <554E41EE.2010202@ignoranthack.me> References: <554E41EE.2010202@ignoranthack.me>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On 05/09/15 10:20, Sean Bruno wrote: > > tl;dr What are the kernel config options to get good output of > kgdb? > > > I'm trying to get the ability to debug and display internal > variables, as one does, with kgdb. I'm *must* be doing this wrong > as I cannot get any useful output from accessing variables that > were JUST accessed in order to invoke a panic() that I have > inserted. This is a GENERIC kernel without INVARIANTS and without > WITNESS: > > https://people.freebsd.org/~sbruno/wtf_kgdb.txt > > I seem to have debug enabled and am able to browse source, but I > obviously haven't compiled correctly as things are optimized out. > > sean > A little bit of progress and learning on my side, so that's good. I'll be patching gdb with a couple of 10-year old upstream commits later today to squash some type missing errors, "#0 doadump (textdump=Unhandled dwarf expression opcode 0x93". Review is here https://reviews.freebsd.org/D2534 sean -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQF8BAEBCgBmBQJVVhBTXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXRCQUFENDYzMkU3MTIxREU4RDIwOTk3REQx MjAxRUZDQTFFNzI3RTY0AAoJEBIB78oecn5k9MQH/ioTLENq1AZRDsOQaRR8U4lF 5iD6cWYgfqkUrLr5VZv6OyVK6zMbf4Jk/PClN7c7m4rVp7tC2kGeiitbaRVOaGxU nb2zJ7eTs6uufCqd9wS3PWjwZlKhggAE9OplPIckU2oy4vlI7tr8DWuh5Mlr/el0 qJ2Bmnzp0vHPqniyCEsxgd/7xm8KjzN6CJASzIdgEd2bVMXbtAHG1XQ6lry+8NJ/ dpwrs9KqHc4xvR7frQzaek2soDIrdOEKV9f4e+PCBav1MbZKoVzYARR3+8LjHd7W k0oNhl8FqqqUYnwS+iBzc/08K6VbIpkzEJzxGXDUsSp++9e8x9umE7FwMdKY2lo= =4LZI -----END PGP SIGNATURE-----
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